VandykeT/A

I had my car professionally tuned speed density and with part throttle in a high gear the car will peg my wideband rich. I'm new to hptuners but I want to fix this disaster they've got in the car. I assume the ve table is where the problem lies. Correct me if I'm wrong. The car will also go full rich in open loop to the point it misfires like crazy. It has to be warmed up before you can really drive it. What parts of the tune do I need to work on to fix this. I pulled the heads to replace lifters and at the tops of the bore above the rings is carboned to hell and back I assume is from all the fuel.

LSX Power Tuning

iTrader: (4)

What kind of vehicle? If it's in SD it's either your ve table, ifr table, or both.

VandykeT/A

2002 trans am m6 with a 408

VandykeT/A

Assuming the ifr table is the problem. Would it be as simple as going in and entering the correct data for my injectors and done? The PE table is actually commanding a 11.1 afr from around 5k on up if I remember right and the bottom half is commanding a 12.6. In reality at wot above say 3k I stay in the 12.6 to 12.8 range on my wideband so I assume that is the ve table is off and they rigged the pe to compensate.

LSX Power Tuning

iTrader: (4)

From your describing I would guess all your fueling is not correct. I would first get the correct injector data in the pcm them start over from a stock ve table and actually tune the ve table. If your all your fueling is correct if you command 12.6 in pe it will actually be 12.6 real world.

VandykeT/A

I actually talked to the tuner and he said that the injector data was correct or everything else would have been out of whack that the problem is that I'm hitting points in the VE that he couldn't hit while on the dyno. Does that seem logical or is the data definately off? Another thing I noticed if I put the car in say 6th gear and let it lug down to around 1200ish rpm (at 1300 it has great torque so its not that it just doesn't make power there) it'll go extremly lean and cut out for a second until it gets above a set rpm. I'm assuming that is a VE point that wasn't touched either. I'll try to find the data for my injectors and see whats in the ecm.

LSX Power Tuning

iTrader: (4)

If the injector data is off it will get made up for in the VE table and most people wont even realize it. Its possible that parts of the VE table were not hit during the tune on the dyno if they werent using a loaded dyno. I use a load bearing dyno with a big eddy brake to avoid that situation. I can vary the load to duplicate almost any driving condition, even with being said I still take the vehicle on the street to double check and tweak anything if necessary. It sounds like your tune may just need some work.

ctd

iTrader: (1)

If you want good answers you need to post a tune file & even better a log demonstrating your issue's It doesn't help casting blame, many times their are mechanical issue's. Some expect the tuner is magical on the keyboard & will throw pixy dust to cure all other imposed problems.

VandykeT/A

Well the car didn't have any of these issues on the tune for the other motor with the 408. The car actually drove better on the tune for the 346. The 346 tune did have a 2-3k lean spot occasionally which was corrected but other than that the hanging idle, extremely rich condition wasn't there. The car was tuned with a vacuum leak which I think contributed to most of the issues while being tuned. Stuff just happens and I need to fix it.

mrvedit

The "Open Loop EQ Ratio" table can also change your A/F ratio, although I suspect many tuners leave this as-is. Also make sure the "Cylinder volume" is set correctly.
As mentioned, I also suspect the injector data is wrong. Very few injectors are available with full data. What injectors are installed?
The VE table should be very smooth. Look at it in 2D chart view; other than maybe the 15 and 20kPa lines, they should all flow on top of each other and not cross each other.

VandykeT/A

It has the 42lb racetronix injectors

mrvedit

And did Racetronix supply the tuning data? In some fairly recent threads on HPTuners.com people complained that they could not get verified data, although someone else said it is available to registered customers on the Racetronix support forum if you agree not to share it publicly. Crazy that they would require that as the tuning data is useless for any other injectors. Premium companies like Injector Dynamics and DeautschWorks have the tuning data on their website and supply actual tested flow rates with their injectors.

Some people assume that their Injector A is close enough to Injector B to use Injector B's tuning data. That is a faulty assumption and leads to tuning problems. While the VE table can compensate to some extent for a faulty IFR table, a fault offset table could make you chase your tail forever. Some injectors have very similar offsets for e.g. 12V and 14V while others might be a full millisecond different. As a result, your tune might start perfect, but be pig rich when the cooling fans turn on causing the voltage to drop, or vice versa.

Not saying that is the case, just be sure that the actual injector tuning data was used and not something generic.

JakeFusion

iTrader: (7)

Post the tune please. In SD, your O/L SD EQ table sets the baseline and the PE and other tables are additive modifiers for commanding A/F. Once you get those set where you want and (hopefully disable things like LTFT where it just keeps adding fuel) you then tune the VE to hit commanded A/F.

JDMC5

iTrader: (3)

could be a lot of things. Try to post a tune and log file.

VandykeT/A

My laptop with the tune is at work I can post it tomorrow. The car is currently blocked in my friends garage where I've been pulling weight from it in the evenings. I'm getting the cruise control effect also so I assume the base running airflow is off to.

JDMC5

iTrader: (3)

could be that or your cracker, or the TB is a POS like the fast.

VandykeT/A

It never did this until after the tune. The tb is a nw and been there a while.

JDMC5

iTrader: (3)

unless something mechanical is going on it sounds like the tune ya.

VandykeT/A

jhr tune trans am.hpt

JDMC5

iTrader: (3)

that file doesn't work and we need a scan and mods list